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서유진,박영만,문세근,Seo, Yu-Jin,Park, Yeong-Man,Mun, Se-Geun 대한인간공학회 2003 大韓人間工學會誌 Vol.22 No.3
The purpose of this study is to investigate the present conditions of the night work and shift work systems in the heavy chemical industrial complexes found in Changwon, Masan, and Chinhae. Korea. We will attempt to define and classify their problems; and to discover further ways to improve their systems. Fifty production factories were carefully selected as the subjects for this study. The shift systems were classified into five categories. The consecutive night shifts were long in almost all cases with 6 days (36 factories) and 7 days (13 factories). It was found that the night work of about] 2 hours continues for a long period in the weekly rotation full-day shift systems and the night-including non-full-day shift systems, and there was no holiday during a shift cycle in the continuous full-day shift systems. The work time in most shift systems was longer than the 44-hours/week permitted by Korean law. Considering the characteristics of these various types of shift systems, the most essential thing to reduce the shift workers' work load may be to shorten their working hours and improve the schedule of shift systems. It is highly recommended as a fundamental solution. to reduce the portal-to-portal hours from 12 to 8 in the night-including non-full-day shift systems and the weekly rotation full-day shift systems, and at least to employ a 4-team 3-shift system in the continuous full-day shift systems. In addition to this, it should from now on be taken as a goal to restructure the types of shift systems by taking such measures as avoiding continuous night work if possible, providing sufficient off-duty intervals both before and after night shift, providing increased opportunities for workers to nap during night work. and increasing the number of holidays.
190-m Heliox 해상 포화잠수에서의 수면패턴과 하루주기리듬
서유진,최기덕,松本一?,문세근,장영민,김보선 대한인간공학회 2006 대한인간공학회 학술대회논문집 Vol.- No.-
The purpose of this study is to examine sleep structure and circadian rhythmicity under the hyperbaric environment to obtain fundamental data so that a desirable sleep environment for divers may be organized using actigraphy. The actigraph activities were measured over a period of 55 nights under a He?O₂ opensea hyperbaric saturation dive to 20 ATA with excursions to 21 ATA. Individual time series were analyzed according to autocorrelation function, fast fourier transform, and power spectrum analysis (PSA) using wrist actigraphy, in order to estimate the prominent circadian period (tau=24-h) and to evaluate each days differences. The autocorrelation function for the time series of each day showed significant circadian rhythmicity with circasemidian rhythmicity (tau= about 12-h) except the 1st day of the bottom period. The PSA for the time series of each day showed significant, about 25-h circadian rhythmicity with circasemidian rhythmicity, on the 1st, 2nd, and 5th days of the decompression period. The 2nd day of the bottom period showed a significant circadian rhythmicity with circasemidian rhythmicity, about 26-h. The results of FFT showed similar changes to the autocorrelation function.
자연과학편 : 20 ATA Heliox 해상 포화잠수에서의 수면패턴
서유진(YooJinSeo),최기덕(KiDuckChoi),송본일미(MatsumotoKazuya),김명일(MyungIlKim),문세근(SeKeunMoon),허만동(ManDongHuh) 한국체육학회 2006 한국체육학회지 Vol.45 No.2
본 연구에서는 190-m heliox 해상 포화잠수에서의 수면패턴을 조사하였다. 잠수사 5명을 대상으로 액티그라프를 이용하여 연 55일간 수면변수의 변화패턴을 측정하였다. 총수면시간, 수면시간, 수면효율, 입면잠시, 낮잠시간, 낮잠회수를 각 실험일에 대해서 일원분산분석을 한 결과 유의한 차를 보였다. 입면잠시를 수반한 총수면시간, 수면시간, 수면효율은 해저체재기 2일째부터 감압기 동안에 유의하게 짧았다. 중도각성시간과 중도각성회수는 해저체재기 2일째부터 감압기 동안에 증가하였으나 각 실험일간에 유의한 차를 보이지는 않았다. 낮잠시간과 낮잠회수는 해저체재기 2일째부터 감압기 동안에 유의하게 증가하였다. 낮잠시간을 종속변수로, 야간수면파라미터를 독립변수로 한 단계별 진입 다중회귀분석을 실시한 결과 입면잠시만 낮잠시간과 유의한 양의 상관관계를 보였다. The sleep patterns were examined during the open-sea 190-m heliox saturation dives. The actigraph of 5 divers was recorded for a total of 55 nights, as were patterns of change in sleep variables. The results of the one-way ANOVA, among the experimental days, showed significant effects in total sleep time, sleep period time, sleep efficiency, sleep latency, length of daytime naps, and number of daytime naps. Total sleep time in accordance with the sleep latency, sleep period time, and sleep efficiency was significantly shortened through the second day of the bottom period to the decompression period. An increase of the wake after sleep onset and the number of awakenings were observed through the second day of the bottom period to the decompression period. However, wake after sleep onset and the number of awakenings showed no significant effect among the experimental days. A significant increase of the length and the number of daytime naps was observed through the second day of the bottom period to the decompression period. The multiple linear regression analysis with stepwise method was applied to assess the correlations between the length of daytime naps as the dependent variable and the nocturnal sleep parameters as the independent variables. SL only showed a significant positive correlation with length of daytime naps.